Ferrets are fun little critters! I have 6, all rescues. I also have a friend that has a ferret rescue.
Ferrets really don't need elaborate cages, just at least an hour out of their cage every day. Mine sleep and eat in the second bathroom and I play with them in a bedroom. I use a play pen so they don't chew on everything they aren't supposed to. Usually shots consist of cat rabies and doesn't cost much. Don't use cat litter in their cage or anything like that. They do best on layers of newspaper that is changed often. If you can, get a buddy for the ferret you might get. Ferrets do better in pairs. Also be sure to trim their nails and make sure to feed them a high protein diet. No vegetables, fruit, sugar, or crap. Ferrets need higher protein and will get sick if given any of the previous. I recommend Totally Ferret food.
Let me know if you have any questions, I would love to help.